data model for Author, Repository, Manager and Test

Author: hhimanshu

pom.xml

@@ -37,7 +37,10 @@
 			<groupId>org.springframework.boot</groupId>
 			<artifactId>spring-boot-starter-web</artifactId>
 		</dependency>
-
+		<dependency>
+			<groupId>org.springframework.boot</groupId>
+			<artifactId>spring-boot-starter-data-jpa</artifactId>
+		</dependency>
 		<dependency>
 			<groupId>com.h2database</groupId>
 			<artifactId>h2</artifactId>
@@ -48,7 +51,7 @@
 			<artifactId>spring-boot-starter-test</artifactId>
 			<scope>test</scope>
 		</dependency>
-	</dependencies>
+  </dependencies>
 
 	<build>
 		<plugins>

src/main/java/com/hhimanshu/business/AuthorsManager.java

@@ -0,0 +1,23 @@
+package com.hhimanshu.business;
+
+import com.hhimanshu.persistence.entities.Author;
+import com.hhimanshu.persistence.repositories.AuthorRepository;
+import java.util.stream.Stream;
+import java.util.stream.StreamSupport;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.stereotype.Component;
+
+@Component
+public class AuthorsManager {
+
+  private AuthorRepository authorRepository;
+
+  @Autowired
+  public AuthorsManager(AuthorRepository authorRepository) {
+    this.authorRepository = authorRepository;
+  }
+
+  public Stream<Author> getAllAuthors() {
+    return StreamSupport.stream(authorRepository.findAll().spliterator(), true);
+  }
+}

src/main/java/com/hhimanshu/persistence/entities/Author.java

@@ -0,0 +1,43 @@
+package com.hhimanshu.persistence.entities;
+
+import javax.persistence.Column;
+import javax.persistence.Entity;
+import javax.persistence.GeneratedValue;
+import javax.persistence.GenerationType;
+import javax.persistence.Id;
+
+@Entity(name = "authors")
+public class Author {
+
+  @Id
+  @GeneratedValue(strategy = GenerationType.AUTO)
+  private Integer id;
+
+  @Column(nullable = false, unique = true)
+  private String name;
+
+  protected Author() {
+    // for JPA
+  }
+
+  public Author(Integer id, String name) {
+    this.id = id;
+    this.name = name;
+  }
+
+  public Integer getId() {
+    return id;
+  }
+
+  public String getName() {
+    return name;
+  }
+
+  @Override
+  public String toString() {
+    return "Author{" +
+        "id=" + id +
+        ", name='" + name + '\'' +
+        '}';
+  }
+}

src/main/java/com/hhimanshu/persistence/repositories/AuthorRepository.java

@@ -0,0 +1,8 @@
+package com.hhimanshu.persistence.repositories;
+
+import com.hhimanshu.persistence.entities.Author;
+import org.springframework.data.repository.CrudRepository;
+
+public interface AuthorRepository extends CrudRepository<Author, Integer> {
+
+}

src/test/java/com/hhimanshu/business/AuthorsManagerTest.java

@@ -0,0 +1,32 @@
+package com.hhimanshu.business;
+
+
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertFalse;
+
+import com.hhimanshu.persistence.entities.Author;
+import java.util.List;
+import java.util.stream.Collectors;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.test.context.SpringBootTest;
+import org.springframework.test.context.junit4.SpringRunner;
+
+@RunWith(SpringRunner.class)
+@SpringBootTest
+public class AuthorsManagerTest {
+
+  @Autowired
+  private AuthorsManager authorsManager;
+
+  @Test
+  public void getAllAuthorsReturnDataFromDatabase() throws Exception {
+    List<Author> authors = authorsManager.getAllAuthors().collect(Collectors.toList());
+    assertFalse(authors.isEmpty());
+    assertEquals(5, authors.size());
+
+    // If you want to compare all the authors to what we inserted in '02-insert-data-authors.xml'
+    // authors.forEach(System.out::println);
+  }
+}